{"id":"CVE-2024-53867","summary":"Synapse Matrix has a partial room state leak via Sliding Sync","details":"Synapse is an open-source Matrix homeserver. The Sliding Sync feature on Synapse versions between 1.113.0rc1 and 1.120.0 can leak partial room state changes to users no longer in a room. Non-state events, like messages, are unaffected. This vulnerability is fixed in 1.120.1.","aliases":["GHSA-56w4-5538-8v8h","PYSEC-2026-1610"],"modified":"2026-08-12T03:51:12.522348880Z","published":"2024-12-03T16:52:01.596Z","related":["openSUSE-SU-2024:14541-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/53xxx/CVE-2024-53867.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-497"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/53xxx/CVE-2024-53867.json"},{"type":"ADVISORY","url":"https://github.com/element-hq/synapse/security/advisories/GHSA-56w4-5538-8v8h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-53867"},{"type":"FIX","url":"https://github.com/matrix-org/matrix-spec-proposals/pull/4186"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/element-hq/synapse","events":[{"introduced":"932cb0a92838918fc38c233be3797adf43b8893d"},{"fixed":"fe3d88b833f76742874642c119b14b788341c905"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"1.113.0rc1"},{"fixed":"1.120.1"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-53867.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"}]}